Office RibbonX Editor

This is based on the original Custom UI Editor but with some additional features.
This is a GitHub open source project created by Fernando Andreu.
You can download the installation file here (scrolling to the bottom of the page).

link - github.com/fernandreu/office-ribbonx-editor/releases/latest 

.NET Framework Version

link - dotnet.microsoft.com/en-us/download/dotnet/thank-you/runtime-desktop-6.0.7-windows-x64-installer